SOLUTION: y is directly proportional to x^2 and y=a for a particular value of x. Find an expression for y in terms of a, when this value of x is doubled. Please help me with this as fast

Question 1078613: y is directly proportional to x^2 and y=a for a particular value of x. Find an expression for y in terms of a, when this value of x is doubled.
Please help me with this as fast as possible. I'm in hurry! Thank you.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
The phrase "y is directly proportional to x^2" means
for a some constant .
In that product, if you double x (you replace for ),
you get ,
so you quadruple the value of and get .
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